Module: AP 计算机科学第二部分 2016

class LogMessage
{
    private String machineId;
    private String description;
    /** Precondition: message is a valid log message. */
    public LogMessage(String message) {      

}


    /** Returns true if the description in this log message properly contains keyword;
     * false otherwise.
     */
    public boolean containsWord(String keyword)
    {      

}


    public String getMachineId()
    { return machineId; }
    public String getDescription()
    { return description; }
// There may be instance variables, constructors, and methods that are not shown.
}

 class SystemLog
{      

/** Contains all the entries in this system log.
         * Guaranteed not to be null and to contain only non-null entries.
         */
    private List<LogMessage> messageList;
    /** Removes from the system log all entries whose descriptions properly contain keyword,
     * and returns a list (possibly empty) containing the removed entries.
     * Postcondition:
     * - Entries in the returned list properly contain keyword and
     * are in the order in which they appeared in the system log.
     * - The remaining entries in the system log do not properly contain keyword and
     * are in their original order.
     * - The returned list is empty if no messages properly contain keyword.
     */
    public List<LogMessage> removeMessages(String keyword)
    {      

}